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How to use multíparm to create groups procedurally

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I am attempting to use a multiparm block list to dynamically create groups from a selection. The selection is coming from the top of the HDA using an action button with a string parameter. 

Currently I am able to make my selection but when iterating over it in a for loop for some reason I’m not able to bind the channel reference to my parameter. 

Basically what I am doing is taking that string and trying to bind the “Group” variable of a vex node so that I can run some vex code to give a name attribute to just those selected primitives.  I know I can bind the group to a parameter because I am doing it in other places in the tool but for the multiparm the channel never turns green even though I pass it a string to my HDA’s parameter


Has anyone attempted this? Will I need python? If so what should I look into?

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